MCL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.The most obvious sypmtom of MCL injury is pain. Following the injury, you will experience pain in the knee, usually along the iside of the joint.CL injury is also part of the  Unhappy Triad , or the common injury of the MCL, ACL, and Meniscus all together, usually through a pivot shift type of mechanism.
With hemangiosarcoma, the pericardium fills up with blood due to rupture of the tumor. When the tumor occurs in the skin, a mass or lump can usually be felt in or under the skin. The mass may become ulcerated and bleed. When the tumor occurs in a bone, it can cause pain and discomfort.
An ecchymosis is a bruise. A hematoma is a blood clot. A Hematoma is a collection of clotted blood outside a blood vessel. A Ecchymosis(commonly called a bruise) is blood leaked out from a blood vessel under the skin. Hematomas are swellings and has more of a three dimensional character to it, while ecchymoses are flat. As well, hematomas may occur in any organ and not just under the skin like ecchymoses.